The Bachelor: Sean Tells All: Do not confuse this with the “Ladies Tell All” special that is headed our direction in a couple weeks. This is Sean’s time to explain himself and some of his more recent, questionable decisions. 8 p.m. ABC

Cult: Yet another series about a deadly cult, this one with a television twist. Series premiere. 8 p.m. The CW

Frontline: Raising Adam Lanza: And now for something more serious. A look into the life of Adam Lanza, and the gun-control debate. 9:30 p.m. PBS